Yes, that's why all the smartest "skilled" players take inferior gear and use inferior set-ups, because their leet "skills" will make up for it. That and their kickbots, rotation bots, fly and lag hacks, exploits...which themselves take a certain amount of "skill" to use...
People that use the term "skill" re WoW PvP are generally in constant fap mode feeding their egos or someone elses, in a fantasy world thinking they're the best thing since sliced bread and everyone else is a scrub. It's always the other guy that lost the match for them, but never them. That's called having delusions of grandeur and how many hundreds of times have we all seen it?
The fact is that given equal "skill" among players, a few percentage points better gear will win matches more than not, especially in Legion's "gear doesn't matter" alternate reality.